As mentioned, there are lots of pro-German TL's here. I recommend you try searching for a poster called Eurofed-he has a couple TL's were German unification extends to Austria, and Germany becomes an enlightened, democratic world power against crazy right-wing France.
Thanks for the commendation. But Onkel Willie is an even more prolific and better author of pro-German TLs than me.
Some links for the OP:
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United States of the Americas and Oceania". By yours truly. (in progress). It is focused on a stronger, larger USA that gradually unifies the Americas, but also includes an Europe where Greater Germany and a stronger Italy unify and a stronger Russian empire arises after the Napoleonic Wars.
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The Triumph of Barbarossa and the victory of the HRE". By Kairos Fateweaver. (in progress). Barbarossa lives longer and fosters the creation of a centralized HRE. This also leads to a revitalized Byzantine Empire, a successful Angevine Empire, a unified Iberia and Scandinavia, and a radically dewanked Islam.
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European War of 1870". By yours truly. (extensive discussion and planning, not yet a structured TL). Austria-Hungary joins France, Italy and Russia join Prussia/Germany in the Franco-Prussian War. This causes the collapse of the Habsburg Empire with the formation of Greater Germany and a larger Italy, and a stable German-Italian alliance.
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The Twin Eagles and the Lion". By Onkel Willie. (complete). Germany, Russia, and Italy form the Triple Alliance against the Anglo-French-Austrian Entente after the Congress of Berlin, and win WWI in alliance with America.
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Tudor Bulls, Meet 16th Century China German China Shop". By Dr. Waterhouse. (incomplete). Dynastic changes in Renaissance Saxony lead to a different Thirty Years' War, and the near-complete Saxony-led unification of Germany (including Bohemia-Moravia, but not Bavaria and Austria) in the 17th century.
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When Decades-old Alliances Were Not Broken". By EmmettmcFly55. (complete). Italy joins the CPs during WWI and makes them win the war.
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A Liberal German Empire". By Onkel Willie. (complete). Greater Germany unifies under the Hohenzollern and Italy under the Savoia in 1848. The German-Italian alliance eventually unifies Europe and becomes one of the superpowers with a North America-spanning USA and a modernized Imperial China after three World Wars.
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A different 1866". By yours truly. (on indefinite hold). Italy wins a decisive victory in the 1866 war, Prussia/Germany and Italy remain allied against France, and Austria collapses after a few years.
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The Munich Coup". By Onkel Willie. (complete). The Nazi regime is overthrown by a military coup during the Munich crisis, Germany returns to a democratic Kaiserreich regime, recovers the Sudetenland by peaceful means and the Corridor with a limited German-Polish War. WWII is fought by the Euro-American Allies vs. the Soviet-Japanese Axis.
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The Prince of Peace". By Feelin. (complete). Another take on a centralized HRE. Here the PoD is the survival of Henry VI Hohenstaufen.
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The Empire of Frederich III". By Onkel Willie. (complete). The PoD is the survival of Frederick III Hohenzollern.
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Ride the Wave Habsburg". By Van555. (in progress/incomplete). The Habsburg have a leap of insight in 1848, split their empire in three parts, and take the lead of the German and Italian unifications, forming a dynastic alliance of Germany, Italy, and Hungary.
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Phony War, Short War". By yours truly. (stalled due to writer's block). Hitler and many of the Nazi bigwigs are assassinated by the Burgenbraukeller bombing in Nov. 1939, the SS are wiped out in the succession power struggle, a diarchy of the Wehrmacht and the moderate technocratic wing of the Nazi bureucracy takes over and makes a compromise peace with the Entente (Germany keeps the Sudetenland, Danzig, West Prussia, Upper Silesia and bits of Posen, it restores the independence of Czechia and Poland). WWII as we know it is aborted, Stalin goes to an expansionistic rampage vs. Japan and China, a Cold War between the USSR and an European alliance ensues.
And for the darkest variant of all, AKA Naziwank:
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The Long Night Falls". By yours truly. (complete). Interwar discovery of oilfields in Libya and Manchuria and earlier, closer Italo-German alliance lead to a stronger and more integrated "evil but smart" Axis (with expansion of Lebensraum plans to the Arab world) that inflicts a decisive defeat to Britain and the USSR, while America remains neutral. The victorious Nazifascists fully implement their genocidal plans on Slavs, Arabs, and Africans, leading to an unified European empire which spans Europe, Russia, North Africa, the Middle East, and Southern Africa. But their society gradually evolves away from loony totalitarianism under the pressure of an eternal Cold War with the North American Union and its Anglo-Indian-South American allies. Eventually both Europe and America evolve into biopunk, spacefaring superpowers.
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The Great Mistake". By Onkel Willie. (complete). Entente intervention in the Winter War and bombing of Baku, and the timely death of Hitler, lead to stable German-Italian-Soviet Axis which wins WWII. Eternal Cold War with America ensues, as the Euro-Soviet bloc gradually picks a reformist PRC-like course and avoids collapse.